... Though I have never seen a representation of a God with human head and animal body, besides the sphinx. Nefertum is close to this idea being a human head with the body of the lotus bush. ...

Where would you have seen such a representation of the god Nefertum? And, to save time, the well-known wooden figure from the tomb of Tutankhamun is not a representation of the god Nefertum. It identifies the young king with the sun god Ra, who was born from out of the ur-lotus, on the ur-isle (creation myths of Iunu / Heliopolis).

The earliest secured piece of evidence for Sakhmet is from the 5th Dynasty. It is a relief from the temple of king Ni-User-Ra in Abusir (see LÄ V - 1984 - Sachmet - Col. 324-325, Note 36 & 37).

The most representations show her with the head of a lioness and the body of a woman. The "Lexikon der Ägyptischen Götter und Götterbezeichnungen" (2002, Vol. VI, p. 556) mentions only a single representation from the Greco-Roman Period, in which the goddess appears as a lamentation woman with human head (and body)._________________Ägyptologie - Forum (German)

Oh, ok. There is a picture accompanying the spell, "For being transformed into a lotus" showing a hieroglpyh of the lotus bush and human's head coming out of it. This papyrus picture was in the Book of the Dead. I assumed it was Nefertum. Thanks for clearing that up for me.

... It seems like the only anthropomorphic body of an animal is the lion.

No.

Even if the shape of animal body with human head is certainly rare, there are also other examples. We see "Osiris, numerous of faces" sometimes with the body of a crocodile and human head (Coffin of Ank-rwtj, LP - 4th century BC, see Petrie, Hawara, Biahmu and Arsinoe, 1889, p. 21, Pl. II, today in Cairo and a small statue in Budapest, Museum of Fine Arts 51.329).

Also Sobek could be worshiped in this form (Nfr-rnpt, 19th Dynasty, TT 336, P.Brüssel MRAH E.5043). There are certainly other examples, if one searches ..._________________Ägyptologie - Forum (German)